F=3
Extend quoted-printable to EBCDIC V8.7 and later
When sendmail is required to
convert a message body into quoted-printable form as determined by
the EightBitMode
option (EightBitMode on page 1025)
it ordinarily converts only those characters that
are required by RFC1521. Unfortunately, mail that is
transmitted to some IBM machines (specifically those
that speak EBCDIC instead of ASCII) can become
garbled because of the way EBCDIC represents (or
fails to represent) certain characters. Those
characters are:
! " # $ @ \ [ ] ^ ` { | } ˜When sending MIME mail to such sites, you should
probably set the F=3 delivery agent flag for any
delivery agents that handle those sites. Setting
this delivery agent flag tells
sendmail to encode those
characters, in addition to those normally encoded,
using quoted-printable.
Note that sendmail does this encoding only if 8-bit characters appear in the message. This delivery agent flag solves one EBCDIC problem but should not be thought of as a general solution for all EBCDIC problems.
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